using BasemapGallery with Expand, not sizing properly and no scrollbar.
let basemapGallery = new BasemapGallery({
container: document.createElement('div'),
view: mapView
});
let expand = new Expand({
expandIconClass: 'esri-icon-basemap',
expandTooltip: 'Basemap Gallery',
view: mapView,
content: basemapGallery
});
mapView.ui.add(expand, 'top-right');
title property, although set, is not showing: